81419741 has 4 divisors (see below), whose sum is σ = 87682812. Its totient is φ = 75156672.

The previous prime is 81419717. The next prime is 81419743. The reversal of 81419741 is 14791418.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6528025 + 74891716 = 2555^2 + 8654^2 .

It is a cyclic number.

It is not a de Polignac number, because 81419741 - 2⁶ = 81419677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81419743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3131516 + ... + 3131541.

It is an arithmetic number, because the mean of its divisors is an integer number (21920703).

Almost surely, 2^81419741 is an apocalyptic number.

It is an amenable number.

81419741 is a deficient number, since it is larger than the sum of its proper divisors (6263071).

81419741 is a wasteful number, since it uses less digits than its factorization.

81419741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6263070.

The product of its digits is 8064, while the sum is 35.

The square root of 81419741 is about 9023.2888128442. The cubic root of 81419741 is about 433.4209557853.

The spelling of 81419741 in words is "eighty-one million, four hundred nineteen thousand, seven hundred forty-one".